title: Effect of housing systems on the bacterial flora of egg shells.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000145:classification* / Q000302:isolation & purification*; D002645:Chickens; D004528:Egg Shell / Q000382:microbiology*; D005260:Female; D006799:Housing, Animal / Q000592:standards*; D010058:Oviposition